US20120193818A1 - Diffuser tube - Google Patents
Diffuser tube Download PDFInfo
- Publication number
- US20120193818A1 US20120193818A1 US13/442,677 US201213442677A US2012193818A1 US 20120193818 A1 US20120193818 A1 US 20120193818A1 US 201213442677 A US201213442677 A US 201213442677A US 2012193818 A1 US2012193818 A1 US 2012193818A1
- Authority
- US
- United States
- Prior art keywords
- diffusion
- slit
- membrane member
- slits
- diffuser tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000009792 diffusion process Methods 0.000 claims abstract description 73
- 239000012528 membrane Substances 0.000 claims abstract description 44
- 230000000149 penetrating effect Effects 0.000 claims description 5
- 239000010802 sludge Substances 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 9
- 239000007789 gas Substances 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229920002943 EPDM rubber Polymers 0.000 description 2
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 2
- 238000005273 aeration Methods 0.000 description 2
- 238000005276 aerator Methods 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/20—Activated sludge processes using diffusers
- C02F3/201—Perforated, resilient plastic diffusers, e.g. membranes, sheets, foils, tubes, hoses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
- B01F23/23105—Arrangement or manipulation of the gas bubbling devices
- B01F23/2312—Diffusers
- B01F23/23124—Diffusers consisting of flexible porous or perforated material, e.g. fabric
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
- B01F23/23105—Arrangement or manipulation of the gas bubbling devices
- B01F23/2312—Diffusers
- B01F23/23126—Diffusers characterised by the shape of the diffuser element
- B01F23/231265—Diffusers characterised by the shape of the diffuser element being tubes, tubular elements, cylindrical elements or set of tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
- B01F23/23105—Arrangement or manipulation of the gas bubbling devices
- B01F23/2312—Diffusers
- B01F23/23123—Diffusers consisting of rigid porous or perforated material
- B01F23/231231—Diffusers consisting of rigid porous or perforated material the outlets being in the form of perforations
- B01F23/231232—Diffusers consisting of rigid porous or perforated material the outlets being in the form of perforations in the form of slits or cut-out openings
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Definitions
- the present invention relates to a diffuser tube for diffusing gases in a processing tank used in a sewage-treatment facility and the like.
- FIG. 8 shows an example of a conventional diffuser device for sludge, which is formed of a vinyl chloride (PVC) tube 1 provided with a plurality of diffusion holes 2 having a diameter of about a few millimeters.
- the conventional diffuser device has drawbacks that, when the diffusion operation stops, the sludge comes into the interior of the tube through the diffusion holes 2 and clogs them up.
- Japanese Patent No. 3353225 describes such a conventional diffuser device which is an aerator.
- the aerator has a flat base 3 and an expandable sheet 4 disposed on the flat base 3 .
- a number of slits 5 are formed in the sheet 4 such that a pressurized gas is supplied through the slits 5 into a liquid such that numerous bubbles are formed in the liquid.
- a movable portion 9 of the sheet 4 expands to open up the slits 5 , and the air is belched though the slits 5 during the diffusion operation.
- a slit cutting surface 6 a of the movable portion 6 and a slit cutting surface 7 a of a main body portion 7 of the slit 5 are biased from a base surface in a direction perpendicular thereto.
- the opposing slit cutting surfaces 6 a and 7 a of the slit 5 are parallel with a direction perpendicular to a surface of the sheet 4 and the base surface, the slit cutting surface 6 a on the movable portion 6 side of the sheet 4 moves with respect to the slit cutting surface 7 a of the main body portion 7 in the direction of the cutting surfaces.
- a friction between the slit cutting surfaces 6 a and 7 a acts as a resistance that obstructs the opening of the slit 5 , and as a result, it causes a problem of increasing the pressure loss as a result.
- the embodiments of present invention solves the problems mentioned above, and objects of the present invention include providing a diffuser tube capable of preventing the sludge from entering the tube when the diffusion operation is not performed, preventing the diffusion holes and the tube from clogging, and reducing the pressure loss during the diffusion operation is reduced.
- a diffuser tube of an embodiment of the present invention includes a membrane member formed of a tubular elastic body having an inner surface which is in communication with an air supply source, and a plurality of diffusion slits formed on and penetrating through the membrane member, the diffusion slits having a non-straight line shape.
- Each of the plurality of diffusion slits has a slanted surface portion formed in at least a predetermined portion thereof, and cutting surfaces of the diffusion slit in the slanted surface portion are slanted with respect to a radial direction of the membrane member.
- the diffusion slit and a line segment formed between both ends of the diffusion slit define a closure region.
- a slit cutting surface on a closure region side of the membrane member overlays, from without, an opposing slit cutting surface on the remaining side of the membrane member.
- the diffusion slits are formed in an arc shape, a chevron shape, or a bracket shape.
- the diffuser tube in accordance with an embodiment of the present invention further includes a support member formed as a tubular body to hold an inner surface of the membrane member, the support member having a plurality of openings penetrating through a wall of the tubular body, the openings being provided so as not to overlap the plurality of diffusion slits.
- the slit cutting surface on the closure region side of the membrane member overlays, from without, the opposing slit cutting surface on the remaining side of the membrane member in the slanted surface portion, and thus the resisting force such as a friction resistance between the closure region side and remaining membrane member side of the diffusion slit can be reduced when the diffusion slit opens up as a diffusion hole.
- the diffusion slits are easily open up and thus the pressure loss during the diffusion operation is reduced.
- the closure region which receives a water pressure from without is pressed onto the remaining membrane member such that the slit cutting surface on the closure region side is water-tightly in pressure-contact with the slit cutting surface of the remaining membrane member side, sludge is prevented from entering the tube, and thus clogging of the tube is also prevented when the diffusion operation is not performed.
- FIG. 1 is a diagram showing a perspective view of a diffuser tube in accordance with an embodiment of the present invention.
- FIG. 2 is a diagram showing an exploded perspective view of the diffuser tube in accordance with the embodiment.
- FIG. 3 is a diagram showing a schematic view of the diffusion slit in accordance with the embodiment.
- FIG. 4 is a diagram showing a cross-sectional view of the diffusion slit along line A-A in FIG. 3 .
- FIG. 5 is a diagram showing a cross-sectional view of the diffusion slit along line B-B in FIG. 3 .
- FIGS. 6A-6B are diagrams showing a diffusion slit in accordance with an embodiment of the present invention.
- FIG. 6A shows the diffusion slit in an open state; and
- FIG. 6B shows the diffusion slit in an closed state.
- FIGS. 7A-7D are diagrams showing diffusion slit patterns of the diffusion tube viewed from above in accordance with embodiments of the present invention: FIG. 7A shows arc-shaped slits facing an outside from a center; FIG. 7B shows chevron-shaped slits pointing outwardly from a center; FIG. 7C shows bracket-shaped slits opening toward a center; and FIG. 7D shows arc-shaped slits facing a center form the outside.
- FIG. 8 is a diagram showing a plan view of a conventional diffuser tube.
- FIG. 9 is a diagram showing cross-sectional view of a conventional diffuser device.
- a diffuser tube 51 has a main body formed of a membrane member 52 and a support member 53 inserted to the membrane member 52 .
- the membrane member 52 is formed of a tubular elastic body made of EPDM (ethylene-propylene-diene rubber), polyurethane resin, silicon rubber, or the like
- the support member 53 is formed of a tubular body made of a resin or metal.
- a plurality of diffusion slits 54 are provided on an upper region and a lower region of the membrane member 52 .
- the diffusion slits 54 pass through the membrane member 52 from one side to the other, and have a non-straight line shape, for example, an arc.
- the arc of the diffusion slit 54 and a line segment L formed between both ends of the diffusion slit 54 define a closure region 56 enclosed therein.
- the closure region 56 can deform independently from the membrane member 52 , not following an expansion of the membrane member 52 during the diffusion operations.
- the diffusion slit 54 has a slanted surface portion 55 formed in at least a predetermined portion, for example, a predetermined region including the center portion of the arc as shown in FIG. 3 .
- the slanted surface portion 55 may be provided over the entire diffusion slit 54 .
- cutting surfaces of the diffusion slit 54 are slanted with respect to a radial direction 57 of the membrane member 52 , such that a slit cutting surface 56 a on the closure region 56 side overlays, from the outside, an opposing slit cutting surface 52 a on the remaining membrane member 52 side.
- the closure region 56 functions as a pseudo-lid, and when the diffusion slit 54 opens up and turns into a diffusion hole, the closure region 56 is separated from the remaining membrane member 52 like a lid covering the diffusion hole is lifted therefrom, thereby reducing resisting force such as a friction resistance between the closure region 56 side and the remaining membrane member 52 side of the diffusion slit 54 , which in turn reduces a pressure loss during the diffusion operations.
- the diffusion slit 54 in accordance with this embodiment is formed in an arc shape facing outwardly from a center.
- the diffusion slit 54 can be a chevron-shaped slit pointing the outside from the center as shown in FIG. 7B , a bracket-shaped slit opening toward the center as shown in FIG. 7C , or an arc-shaped slit facing the center form the outside as shown in FIG. 7D .
- the support member 53 is formed as a bottomed tubular body having a closed end (i.e., a bottom), and supports the membrane member 52 by abutting an inner surface thereof from the inside.
- the support member 53 has a plurality of openings (through-holes) 59 formed on a tubular wall 58 thereof.
- the openings 59 penetrate from one side of the tubular wall 58 to the other and are provided in a region not overlapping the diffusion slits 54 , that is, side regions of the tubular wall 58 .
- the support member 53 and the membrane member 52 are provided with clamping members 60 at the respective ends, which air-tightly attach the support member 53 and the membrane member 52 to each other.
- the other (non-bottomed) end of the support member 53 is an air supply opening 61 connected to a blower 62 which is an air supply source.
- FIGS. 6A and 6B illustrate an operation of the diffusion slit 54 , where only the membrane member 52 is shown and the support member 53 is omitted for the sake of convenience.
- the slit cutting surface 56 a on the closure region 56 side overlays the slit cutting surface 52 a on the remaining membrane member 52 from the outside with respect to the radial direction 57 .
- the closure region 56 receives a water pressure from without, the slit cutting surface 56 a thereof is pressed onto the slit cutting surface 52 a of the remaining membrane member 52 side such that the slit cutting surface 56 a is water-tightly in pressure-contact with the slit cutting surface 52 a, thereby preventing sludge from entering and clogging the tube when the diffusion operation is not performed.
- the diffusion slits 54 are easily open up and thus reduce the pressure loss during the diffusion operation.
- the diffuser tube 51 can be used not only in an aeration tank for sewage treatment facilities, but also in an aeration tank for processing waste water from a variety of industries and water purification as well.
- the diffuser tube 51 can also be installed under an immersion-type membrane separation device and used to clean a surface of the membrane, and a scope of the application of the diffuser tube 51 is not limited by specific examples.
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
Description
- The present application is a Continuation of International Application No. PCT/JP2010/072418 filed on Dec. 14, 2010, which claims benefit of Japanese Patent Application No. 2009-285824 filed Dec. 17, 2009. The entire contents of each application noted above are hereby incorporated by reference.
- 1. Field of Invention
- The present invention relates to a diffuser tube for diffusing gases in a processing tank used in a sewage-treatment facility and the like.
- 2. Description of the Related Art
-
FIG. 8 shows an example of a conventional diffuser device for sludge, which is formed of a vinyl chloride (PVC)tube 1 provided with a plurality ofdiffusion holes 2 having a diameter of about a few millimeters. The conventional diffuser device has drawbacks that, when the diffusion operation stops, the sludge comes into the interior of the tube through thediffusion holes 2 and clogs them up. - In order to prevent the ingress of the sludge, rubber membrane-type diffuser devices have been put into practical use. However, due to a higher pressure-loss during the diffusing operation, the rubber membrane-type diffusers require a higher power for blowers, resulting in an undesirable increase in power consumption.
- For example, Japanese Patent No. 3353225 describes such a conventional diffuser device which is an aerator. As shown in
FIG. 9 , the aerator has a flat base 3 and anexpandable sheet 4 disposed on the flat base 3. A number of slits 5 are formed in thesheet 4 such that a pressurized gas is supplied through the slits 5 into a liquid such that numerous bubbles are formed in the liquid. By making the shape of the slits 5 formed in thesheet 4 in a non-straight line, thesheet 4 is prevented from tearing at the slit portions, whereby the tearing problems is overcome. - In the structure described in the above-mentioned patent reference, a movable portion 9 of the
sheet 4 expands to open up the slits 5, and the air is belched though the slits 5 during the diffusion operation. - However, in an initial state of the diffusion operation where the
sheet 4 starts expanding, two opposing surfaces, that is, a slit cutting surface 6 a of the movable portion 6 and a slit cutting surface 7 a of amain body portion 7 of the slit 5 are biased from a base surface in a direction perpendicular thereto. At this time, if the opposing slit cutting surfaces 6 a and 7 a of the slit 5 are parallel with a direction perpendicular to a surface of thesheet 4 and the base surface, the slit cutting surface 6 a on the movable portion 6 side of thesheet 4 moves with respect to the slit cutting surface 7 a of themain body portion 7 in the direction of the cutting surfaces. Thus, a friction between the slit cutting surfaces 6 a and 7 a acts as a resistance that obstructs the opening of the slit 5, and as a result, it causes a problem of increasing the pressure loss as a result. - The embodiments of present invention solves the problems mentioned above, and objects of the present invention include providing a diffuser tube capable of preventing the sludge from entering the tube when the diffusion operation is not performed, preventing the diffusion holes and the tube from clogging, and reducing the pressure loss during the diffusion operation is reduced.
- To solve the problems described above, a diffuser tube of an embodiment of the present invention includes a membrane member formed of a tubular elastic body having an inner surface which is in communication with an air supply source, and a plurality of diffusion slits formed on and penetrating through the membrane member, the diffusion slits having a non-straight line shape. Each of the plurality of diffusion slits has a slanted surface portion formed in at least a predetermined portion thereof, and cutting surfaces of the diffusion slit in the slanted surface portion are slanted with respect to a radial direction of the membrane member. The diffusion slit and a line segment formed between both ends of the diffusion slit define a closure region. In the slanted surface portion, a slit cutting surface on a closure region side of the membrane member overlays, from without, an opposing slit cutting surface on the remaining side of the membrane member.
- In the diffuser tube in accordance with an embodiment of the present invention, the diffusion slits are formed in an arc shape, a chevron shape, or a bracket shape.
- The diffuser tube in accordance with an embodiment of the present invention further includes a support member formed as a tubular body to hold an inner surface of the membrane member, the support member having a plurality of openings penetrating through a wall of the tubular body, the openings being provided so as not to overlap the plurality of diffusion slits.
- As described above, according to embodiment of the present invention, the slit cutting surface on the closure region side of the membrane member overlays, from without, the opposing slit cutting surface on the remaining side of the membrane member in the slanted surface portion, and thus the resisting force such as a friction resistance between the closure region side and remaining membrane member side of the diffusion slit can be reduced when the diffusion slit opens up as a diffusion hole. Thus, at an onset of the diffusion operation when the air supply to the diffuser tube is started, the diffusion slits are easily open up and thus the pressure loss during the diffusion operation is reduced.
- In addition, since the slit cutting surface on the closure region side of the membrane member overlays, from without, the opposing slit cutting surface on the remaining side of the membrane member in the slanted surface portion, the closure region which receives a water pressure from without is pressed onto the remaining membrane member such that the slit cutting surface on the closure region side is water-tightly in pressure-contact with the slit cutting surface of the remaining membrane member side, sludge is prevented from entering the tube, and thus clogging of the tube is also prevented when the diffusion operation is not performed.
-
FIG. 1 is a diagram showing a perspective view of a diffuser tube in accordance with an embodiment of the present invention. -
FIG. 2 is a diagram showing an exploded perspective view of the diffuser tube in accordance with the embodiment. -
FIG. 3 is a diagram showing a schematic view of the diffusion slit in accordance with the embodiment. -
FIG. 4 is a diagram showing a cross-sectional view of the diffusion slit along line A-A inFIG. 3 . -
FIG. 5 is a diagram showing a cross-sectional view of the diffusion slit along line B-B inFIG. 3 . -
FIGS. 6A-6B are diagrams showing a diffusion slit in accordance with an embodiment of the present invention.FIG. 6A shows the diffusion slit in an open state; andFIG. 6B shows the diffusion slit in an closed state. -
FIGS. 7A-7D are diagrams showing diffusion slit patterns of the diffusion tube viewed from above in accordance with embodiments of the present invention:FIG. 7A shows arc-shaped slits facing an outside from a center;FIG. 7B shows chevron-shaped slits pointing outwardly from a center;FIG. 7C shows bracket-shaped slits opening toward a center; andFIG. 7D shows arc-shaped slits facing a center form the outside. -
FIG. 8 is a diagram showing a plan view of a conventional diffuser tube. -
FIG. 9 is a diagram showing cross-sectional view of a conventional diffuser device. - Hereinafter, embodiments of the present invention are explained with reference to the accompanying drawings. As shown in
FIGS. 1 to 4 , adiffuser tube 51 has a main body formed of amembrane member 52 and asupport member 53 inserted to themembrane member 52. Themembrane member 52 is formed of a tubular elastic body made of EPDM (ethylene-propylene-diene rubber), polyurethane resin, silicon rubber, or the like, and thesupport member 53 is formed of a tubular body made of a resin or metal. - A plurality of
diffusion slits 54 are provided on an upper region and a lower region of themembrane member 52. The diffusion slits 54 pass through themembrane member 52 from one side to the other, and have a non-straight line shape, for example, an arc. As shown inFIG. 3 , the arc of thediffusion slit 54 and a line segment L formed between both ends of thediffusion slit 54 define aclosure region 56 enclosed therein. - Since the
diffusion slit 54 separates theclosure region 56 from theremaining membrane member 52, theclosure region 56 can deform independently from themembrane member 52, not following an expansion of themembrane member 52 during the diffusion operations. - The
diffusion slit 54 has aslanted surface portion 55 formed in at least a predetermined portion, for example, a predetermined region including the center portion of the arc as shown inFIG. 3 . However, theslanted surface portion 55 may be provided over theentire diffusion slit 54. - As shown in
FIGS. 4 and 5 , in theslanted surface portion 55, cutting surfaces of thediffusion slit 54 are slanted with respect to aradial direction 57 of themembrane member 52, such that aslit cutting surface 56 a on theclosure region 56 side overlays, from the outside, an opposingslit cutting surface 52 a on theremaining membrane member 52 side. - As such, the
closure region 56 functions as a pseudo-lid, and when thediffusion slit 54 opens up and turns into a diffusion hole, theclosure region 56 is separated from theremaining membrane member 52 like a lid covering the diffusion hole is lifted therefrom, thereby reducing resisting force such as a friction resistance between theclosure region 56 side and theremaining membrane member 52 side of thediffusion slit 54, which in turn reduces a pressure loss during the diffusion operations. - As shown in
FIG. 7A , the diffusion slit 54 in accordance with this embodiment is formed in an arc shape facing outwardly from a center. However, the diffusion slit 54 can be a chevron-shaped slit pointing the outside from the center as shown inFIG. 7B , a bracket-shaped slit opening toward the center as shown inFIG. 7C , or an arc-shaped slit facing the center form the outside as shown inFIG. 7D . - The
support member 53 is formed as a bottomed tubular body having a closed end (i.e., a bottom), and supports themembrane member 52 by abutting an inner surface thereof from the inside. Thesupport member 53 has a plurality of openings (through-holes) 59 formed on atubular wall 58 thereof. Theopenings 59 penetrate from one side of thetubular wall 58 to the other and are provided in a region not overlapping the diffusion slits 54, that is, side regions of thetubular wall 58. - This is because, if the
openings 59 overlap the diffusion slits 54, such diffusion slits 54 would receive a greater discharge pressure from a diffusing gas and thus open up an greater extent than other diffusion slits 54. Thus, a greater amount of diffusing gas is discharged through such diffusion slits 54 overlapped with theopenings 59 compared with other diffusion slits, resulting in an uneven discharge of the diffusing gas viewed from the diffuser tube as a whole. On the other hand, if theopenings 59 do not overlap the diffusion slits 54, the discharge pressure from the diffusing gas is uniformly applied to themembrane member 52, realizing a uniform discharge of the diffusing gas from the entire diffuser tube. - The
support member 53 and themembrane member 52 are provided with clampingmembers 60 at the respective ends, which air-tightly attach thesupport member 53 and themembrane member 52 to each other. The other (non-bottomed) end of thesupport member 53 is anair supply opening 61 connected to ablower 62 which is an air supply source. - Operations of the above-mentioned structures are explained below.
FIGS. 6A and 6B illustrate an operation of the diffusion slit 54, where only themembrane member 52 is shown and thesupport member 53 is omitted for the sake of convenience. As shown inFIG. 6B , in a state of shutdown in which theblower 62 does not supply air to thediffuser tube 51 through theair supply opening 61, in the slantedsurface portion 55, theslit cutting surface 56 a on theclosure region 56 side overlays theslit cutting surface 52 a on the remainingmembrane member 52 from the outside with respect to theradial direction 57. Thus, since theclosure region 56 receives a water pressure from without, theslit cutting surface 56 a thereof is pressed onto theslit cutting surface 52 a of the remainingmembrane member 52 side such that theslit cutting surface 56 a is water-tightly in pressure-contact with theslit cutting surface 52 a, thereby preventing sludge from entering and clogging the tube when the diffusion operation is not performed. - As shown in
FIG. 6A , when the diffusion operation is being performed, the air is supplied to thediffuser tube 51 from theblower 62 through theair supply opening 61. In this case, since theslit cutting surface 56 a on theclosure region 56 side overlays theslit cutting surface 52 a on the remainingmembrane member 52 side from the outside with respect to the radial direction, a resisting force such as a friction resistance between theclosure region 56 side and the remainingmembrane member 52 side can be reduced. Thus, at an onset of the diffusion operation when the air supply to the diffuser tube is started, the diffusion slits 54 are easily open up and thus reduce the pressure loss during the diffusion operation. - It should be noted that the
diffuser tube 51 can be used not only in an aeration tank for sewage treatment facilities, but also in an aeration tank for processing waste water from a variety of industries and water purification as well. In addition, thediffuser tube 51 can also be installed under an immersion-type membrane separation device and used to clean a surface of the membrane, and a scope of the application of thediffuser tube 51 is not limited by specific examples.
Claims (4)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2009-285824 | 2009-12-17 | ||
JP2009285824A JP5366785B2 (en) | 2009-12-17 | 2009-12-17 | Diffuser |
PCT/JP2010/072418 WO2011074554A1 (en) | 2009-12-17 | 2010-12-14 | Diffuser tube |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2010/072418 Continuation WO2011074554A1 (en) | 2009-12-17 | 2010-12-14 | Diffuser tube |
Publications (2)
Publication Number | Publication Date |
---|---|
US20120193818A1 true US20120193818A1 (en) | 2012-08-02 |
US8616534B2 US8616534B2 (en) | 2013-12-31 |
Family
ID=44167307
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/442,677 Expired - Fee Related US8616534B2 (en) | 2009-12-17 | 2012-04-09 | Diffuser tube |
Country Status (5)
Country | Link |
---|---|
US (1) | US8616534B2 (en) |
EP (1) | EP2476653B1 (en) |
JP (1) | JP5366785B2 (en) |
CN (1) | CN102548915B (en) |
WO (1) | WO2011074554A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140264969A1 (en) * | 2013-03-15 | 2014-09-18 | Environmental Dynamics International, Inc. | Single-layer membrane comprising polytetrafluoroethylene interspersed therein |
ITMI20131139A1 (en) * | 2013-07-05 | 2015-01-06 | Saipem Spa | SYSTEM AND METHOD OF DIFFUSION OF GAS TO ENTER A GASEOUS FLOW, IN PARTICULAR A GASSOUS PASSIVATING FLOW, IN AN APPARATUS OF A UREA PLANT |
WO2018014909A1 (en) * | 2016-07-18 | 2018-01-25 | Alexander Ott | Gassing device |
US10071924B2 (en) | 2013-11-13 | 2018-09-11 | Kubota Corporation | Diffusion pipe and method for cleaning diffusion pipe |
CN115974358A (en) * | 2023-03-16 | 2023-04-18 | 甘肃祥农兆丰农业科技发展有限公司 | Automatic dehydration treatment equipment for livestock manure |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6067242B2 (en) * | 2012-05-11 | 2017-01-25 | 住友重機械エンバイロメント株式会社 | Air diffuser and diffuser |
DE102012013443A1 (en) * | 2012-06-21 | 2013-12-24 | Gottfried Wilhelm Leibniz Universität Hannover | Bubble curtain generating device |
JP5764182B2 (en) * | 2013-11-15 | 2015-08-12 | 株式会社神鋼環境ソリューション | Method for removing residue from a stirring device of a methane fermentation tank, and methane fermentation tank capable of easily removing residue from a stirring device |
CN104445589B (en) * | 2014-10-28 | 2016-03-02 | 北京伊柏机电设备有限公司 | A kind of gas distributor and aerating apparatus |
JP6068519B2 (en) * | 2015-01-22 | 2017-01-25 | 株式会社クボタ | Air diffuser and cleaning method of air diffuser |
EP3293153B1 (en) * | 2016-09-09 | 2021-10-13 | Doosan Lentjes GmbH | A seawater aeration system |
US10843950B2 (en) * | 2018-07-26 | 2020-11-24 | APTwater, LLC | Piping manifold for pulsating flow |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1792286A (en) * | 1928-12-04 | 1931-02-10 | Hewitt Gutta Percha Rubber Cor | Aerator |
DE3318412A1 (en) * | 1983-05-20 | 1984-11-22 | Menzel Gmbh & Co, 7000 Stuttgart | Gassing apparatus |
EP0346109A1 (en) * | 1988-06-08 | 1989-12-13 | Campbell, Elisabeth Mary | Device for circulation and gas exchange in liquids |
US4954296A (en) * | 1988-06-03 | 1990-09-04 | Rita Ott | Gas injection equipment |
US7044453B2 (en) * | 2004-01-08 | 2006-05-16 | Environmental Dynamics, Inc. | Membrane diffuser with uniform gas distribution |
US7243912B2 (en) * | 2004-02-24 | 2007-07-17 | Siemens Water Technologies Holding Corp. | Aeration diffuser membrane slitting pattern |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4322611Y1 (en) * | 1964-02-03 | 1968-09-24 | ||
FR1402244A (en) * | 1964-06-30 | 1965-06-11 | Perforated line pipe | |
JPS5581793A (en) * | 1978-12-15 | 1980-06-20 | Matsushita Electric Works Ltd | Diffusing pipe for polluted water treatment apparatus |
JPS60108398U (en) * | 1982-12-14 | 1985-07-23 | 大野 勝 | Diffuser pipe installed underwater |
DE3441731A1 (en) * | 1984-11-15 | 1986-05-15 | Suprafilt Gesellschaft für Umwelttechnik mbH, 7120 Bietigheim-Bissingen | Aeration element |
DE3508593A1 (en) * | 1985-03-11 | 1986-09-11 | Jäger, Arnold, 3167 Burgdorf | Water aeration tube |
DE3513374A1 (en) * | 1985-04-15 | 1986-11-06 | Arnold 3167 Burgdorf Jäger | Process for producing water aeration pipes |
DE3513368A1 (en) * | 1985-04-15 | 1986-11-06 | Jäger, Arnold, 3167 Burgdorf | Water aeration pipe |
JPH0522098U (en) * | 1991-09-03 | 1993-03-23 | 上田 一 | Air diffuser |
US6280626B1 (en) * | 1998-08-12 | 2001-08-28 | Mitsubishi Rayon Co., Ltd. | Membrane separator assembly and method of cleaning the assembly utilizing gas diffuser underneath the assembly |
JP3353225B2 (en) * | 1998-12-22 | 2002-12-03 | 株式会社モノベエンジニアリング | Aeration device |
JP4513368B2 (en) * | 2004-03-19 | 2010-07-28 | 栗田工業株式会社 | Sewage treatment method and apparatus |
JP4781302B2 (en) * | 2007-03-14 | 2011-09-28 | ダイセン・メンブレン・システムズ株式会社 | Aeration method and water treatment operation method |
CA2696019A1 (en) * | 2007-10-10 | 2009-04-16 | Toray Industries, Inc. | Fine bubble diffusing tube, fine bubble diffusing device and submerged membrane separation apparatus |
JP2009274016A (en) * | 2008-05-15 | 2009-11-26 | Daicen Membrane Systems Ltd | Tube-type membrane diffuser |
-
2009
- 2009-12-17 JP JP2009285824A patent/JP5366785B2/en not_active Expired - Fee Related
-
2010
- 2010-12-14 WO PCT/JP2010/072418 patent/WO2011074554A1/en active Application Filing
- 2010-12-14 CN CN201080044186.0A patent/CN102548915B/en not_active Expired - Fee Related
- 2010-12-14 EP EP20100837580 patent/EP2476653B1/en not_active Not-in-force
-
2012
- 2012-04-09 US US13/442,677 patent/US8616534B2/en not_active Expired - Fee Related
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1792286A (en) * | 1928-12-04 | 1931-02-10 | Hewitt Gutta Percha Rubber Cor | Aerator |
DE3318412A1 (en) * | 1983-05-20 | 1984-11-22 | Menzel Gmbh & Co, 7000 Stuttgart | Gassing apparatus |
US4954296A (en) * | 1988-06-03 | 1990-09-04 | Rita Ott | Gas injection equipment |
EP0346109A1 (en) * | 1988-06-08 | 1989-12-13 | Campbell, Elisabeth Mary | Device for circulation and gas exchange in liquids |
US7044453B2 (en) * | 2004-01-08 | 2006-05-16 | Environmental Dynamics, Inc. | Membrane diffuser with uniform gas distribution |
US7243912B2 (en) * | 2004-02-24 | 2007-07-17 | Siemens Water Technologies Holding Corp. | Aeration diffuser membrane slitting pattern |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140264969A1 (en) * | 2013-03-15 | 2014-09-18 | Environmental Dynamics International, Inc. | Single-layer membrane comprising polytetrafluoroethylene interspersed therein |
ITMI20131139A1 (en) * | 2013-07-05 | 2015-01-06 | Saipem Spa | SYSTEM AND METHOD OF DIFFUSION OF GAS TO ENTER A GASEOUS FLOW, IN PARTICULAR A GASSOUS PASSIVATING FLOW, IN AN APPARATUS OF A UREA PLANT |
WO2015001536A3 (en) * | 2013-07-05 | 2015-07-02 | Saipem S.P.A. | Gas diffusion system and method for introducing a gas stream in an pparatus, in particular a passivating gas stream in a urea plant |
US9694334B2 (en) | 2013-07-05 | 2017-07-04 | Saipem S.P.A. | Gas diffusion system and method for introducing a gas stream in an apparatus, in particular a passivating gas stream in a urea plant |
US10071924B2 (en) | 2013-11-13 | 2018-09-11 | Kubota Corporation | Diffusion pipe and method for cleaning diffusion pipe |
WO2018014909A1 (en) * | 2016-07-18 | 2018-01-25 | Alexander Ott | Gassing device |
US11007493B2 (en) * | 2016-07-18 | 2021-05-18 | Alexander Ott | Gassing device |
CN115974358A (en) * | 2023-03-16 | 2023-04-18 | 甘肃祥农兆丰农业科技发展有限公司 | Automatic dehydration treatment equipment for livestock manure |
Also Published As
Publication number | Publication date |
---|---|
EP2476653A1 (en) | 2012-07-18 |
CN102548915B (en) | 2014-11-05 |
CN102548915A (en) | 2012-07-04 |
JP5366785B2 (en) | 2013-12-11 |
US8616534B2 (en) | 2013-12-31 |
EP2476653B1 (en) | 2014-11-12 |
WO2011074554A1 (en) | 2011-06-23 |
EP2476653A4 (en) | 2012-12-05 |
JP2011125781A (en) | 2011-06-30 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US8616534B2 (en) | Diffuser tube | |
US6367783B1 (en) | Fine bubble diffuser | |
JP4723696B2 (en) | Air diffuser for aeration of fluid | |
US5788847A (en) | Diffuser construction and mounting arrangement | |
US20090301952A1 (en) | Device for fixing a perforated aeration membrane | |
JP5404189B2 (en) | Membrane diffuser | |
JP4704881B2 (en) | Air diffuser | |
JP2005081203A (en) | Air diffuser and air diffusion system | |
JP5349370B2 (en) | Air diffuser and diffuser | |
JP4528219B2 (en) | Air diffuser | |
JPH11179394A (en) | Aeration apparatus | |
US10105659B2 (en) | Dual control lateral air manifold assembly | |
US11235292B2 (en) | Ventilation element | |
JP2003024974A (en) | Air diffusing device and aeration tank using the same | |
JP2007014899A (en) | Air diffusion device | |
JP6246610B2 (en) | Air diffuser | |
US20040164433A1 (en) | Apparatus for aerating water | |
KR100767389B1 (en) | A air diffuser | |
KR200323494Y1 (en) | Dual membrane diffuser | |
KR960005869Y1 (en) | Aerator for use of waste water treatment | |
JP5637815B2 (en) | Membrane diffuser | |
KR100364110B1 (en) | Decantor | |
JP2007030923A (en) | Height raising frame | |
WO2012056740A1 (en) | Membrane air diffuser | |
JPH10211494A (en) | Flow transferring apparatus for septic tank |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: KUBOTA CORPORATION, JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:HIROSE, YOUICHIROU;OKAJIMA, YASUNOBU;SIGNING DATES FROM 20120326 TO 20120327;REEL/FRAME:028015/0435 |
|
STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
|
FPAY | Fee payment |
Year of fee payment: 4 |
|
FEPP | Fee payment procedure |
Free format text: MAINTENANCE FEE REMINDER MAILED (ORIGINAL EVENT CODE: REM.); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
LAPS | Lapse for failure to pay maintenance fees |
Free format text: PATENT EXPIRED FOR FAILURE TO PAY MAINTENANCE FEES (ORIGINAL EVENT CODE: EXP.); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
|
FP | Lapsed due to failure to pay maintenance fee |
Effective date: 20211231 |